Check Engine Light On With DTC P0456 (01-014/14)

Publication date: 2019-01-10
Reference number: 01-014/14
Supersedes refnos: 01-005/19, 01-008/15, 01-013/18

CHECK ENGINE LIGHT ON WITH DTC P0456

TECHNICAL SERVICE BULLETIN

Reference Number(s): 01-005/19, Date of Issue: January 10, 2019

MAZDA:

2016-2019 CX-3; 2013-2019 CX-5; 2007-2019 CX-9; 2011-2019 Mazda3; 2014-2019 Mazda6

Superceded Bulletin(s): 01-013/18, Date of Issue: 05/11/2018, 01-008/15, Date of Issue: 05/15/2015, 01-014/14, Date of Issue: 06/10/2014

BULLETIN NOTES

This bulletin supersedes the previously issued bulletin(s) listed below.

PREVIOUSLY ISSUED BULLETIN LIST

Previous TSBs:	Date(s) Issued:
01-013/18	05/11/2018
01-008/15	05/15/2015
01-014/14	06/10/2014

APPLICABLE MODEL(S)/VINS

2016-2019 CX-3

2013-2019 CX-5

2007-2019 CX-9

2011-2019 Mazda3

2014-2019 Mazda6

DESCRIPTION

Some vehicles may exhibit the check engine light on with DTC P0456 stored in the PCM memory.

P0456: EVAP system leak detected (very small leak)

The concern is most likely the result of the customer not getting the fuel cap completely closed after fueling the vehicle. This causes a small fuel vapor leak and turns DTC P0456 on.

Customers having this concern should have their vehicle repaired using the following repair procedure.

REPAIR PROCEDURE

Verify the customer concern (and that DTC P0456 is stored in the PCM memory).
Perform the MGSS diagnosis procedures for DTC P0456.
- If a leak is detected, repair it according to the instructions on MGSS online.
- If no leak is detected, the most probable cause is the fuel cap was not completely sealed (B).

2011-2013 MAZDA3 and 2007-2015CX-9:

NOTE:

DO NOT replace any parts without detecting a leak using MGSS diagnostics.
Explain to the customer that the fuel cap must be turned at least 80 degrees (C) or until two (2) or more click sounds are heard (D) to be properly sealed.
If the fuel cap is not completely closed, it may stay in the B range, (because the C range is so small) and will likely leak.

2016-2019 CX-3, 2013-2019 CX-5, 2016-2019 CX-9, 2014-2019 MAZDA3 and 2014-2019 MAZDA6:

If the fuel cap is turned less than 200 degrees (B), it is not sealed.
- If the fuel cap is turned between 200 ~ 360 degrees (C), it is sealed.
- If the fuel cap is turned 360 degrees or more, it is sealed and a clicking noise (D) is also heard.

NOTE: The fuel cap may stay within the (C) range, since it is a large range. A leak is unlikely to occur, even if the fuel cap was not closed completely (until clicking sound is heard (D)).

Range	Fuel cap turning angle (degrees)	Description
	2011-2013 Mazda3 and 2007-2015 CX-9		2016-2019 CX-3, 2014-2019 Mazda3, 2014-2019 Mazda6, 2013-2019 CX-5 and 2016-2019 CX-9
A	0	0	Start fuel cap closing.
B	0 - 80	0 - 200	Sealing is NOT complete. A small leak may occur if fuel cap closing is stopped within this range.
C	80 - 90 (small range)	200 - 360 (large range)	Sealing is complete. A leak will not occur, even if fuel cap closing is stopped within this range.
D	> 90	> 360	Complete fuel cap closing (clicking sound is heard).

WARRANTY INFORMATION

NOTE: This repair is not warrantable.